Detailed census records made in Roman Egypt show that brother-sister marriages among members of the non-royal farming class were common.What light does this shed on the incest taboo?

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The fact that brother-sister marriages were common among non-royal farming class in Roman Egypt suggests that despite the general aversion to inbreeding, it may occur within a certain cultural or social context. It contradicts the notion that incest is only committed among royalty to preserve bloodlines (B) or that humans are no different from chimpanzees (E). While it may provide some support for Freud's Oedipus complex (D), the evidence is not conclusive. There is no indication that this finding refutes the biological basis for the avoidance of inbreeding (A).

Detailed Census Records Made in Roman Egypt Show That Brother-Sister